US calls for UN sanctions against Syria

The US president has called on the UN Security Council to impose sanctions on the government of Bashar al-Assad, as Syrian activists said that government forces had killed at least three civilians in the country's northwest. Obama said the Syrian government must be punished for its bloody crackdown on civilian protests, which entered their sixth month last week. "For the sake of Syria - and the peace and security of the world - we must speak with one voice," he said.